1. It's great all books are available. Which ones can YOU actually access? It'll help if we aren't recommending things you can't look up anyway.
2. What level do you think this game will run to? You're starting at 1, it takes a LOOOONG time to 20, and I've never seen a 1-20 game ever actually happen. Knowing roughly where you'll end is important in deciding what to play. You don't want to design around some prestige class you can't even enter till level 6 if the game's only going to level 6ish, for example, and you also wouldn't want a character decent starting out but with really poor options should the game zoom on to level 10 (or whatever) due to the build.
3. You said you already had a backstory and description. What are they? The build needs to be compatible. If he's a sharpshooting bowman, can't really build it as a Warlock (who make decent "magical archers"), for example.
Your backstory sounds like Warlock to me...
Check them out in C.Arcane. You can take Eldritch Spear invocation to have a 250 ft ranged touch attack, and a few levels in, you become extremely proficient in Use Magic Device, so you can have all sorts of wands, scrolls, and gadgets to collect and utilize.
Only problem is you absolutely can't be "the rogue" with 2 + int skill points per level and none of the "rogue skills."